Gripping and forging die.



N. T. Mc'KEE. GRIPPING AND FORGING DIE.

APPLICMION man JULY 7. I914.

1,151,601.. Patented Aug. 31-, 1915.

a SHEETS-SHEET 1.

WITNESSES INVENTOR ME'ALIR/MPLE M IrEE N. T.. McKEE.

GRIPPING AND FORGING DIE.

APPLICATION FILED JULY 7, 1914.

Patented Aug. 31, 1915.

3 SHEETS-SHEET 2.

INVENTOR WEALTH/1461.5 na /(5 WITNESSES B6 ATTORNEYS N. T. McKEE. GRIPPING AND FQRGING m5. APPLICATION FILED JULY 7, 1914.

Patented Aug. 31, 1915.

3 SHEETS-SHEET 3.

TTQ Q Q INVENTOI? IVE/IL TE/MBLE M 'KEE WITNESSES B mum v A TTOHNE Y8 sacrifices re -rs NEAL TEIMBLE McKEE/QF DOBQBS FER-RY, NEVZ YORK/AS5163? QR LQCOMOTIVE SUPERHEATER COMPANY, 0F NEW YGRK, N. Y., A GORPORATIQE? 6F DELAWARE.

I enirrms Annrnonemc my;

To all whom it may concern Be it known that l NEAL TRIMBLE McKee, a citizen of the United States, residing at Dobbs Ferry, in the county of Westchester, State of New York, have invented a certain new and useful Improvement in Gripping and Forging Dies, of which the following is a specification.

. My invent-ion relates to an improved gripping and forging die and has for its object to provide a die which shall grip the work to be forged or otherwise treated with a pres sure which will increase as the operating pressure which tends 50 force the "work out of the die increases. I I

More particularly invention reletes to a die of the class described in which the gripping pressure increases automatically as the operating pressure is increased.

1 find my improved gripping and forging die especially useful in the manufacture of welded pipe bends for connecting the two straight legs of a 'superheater element but do not limit llISglSQ tochis work es'its principle is widely'zlppliceble to dies for various purposes.

in an application ior potent filed by Charles True and myself-on April 30, 1914: and entitled fPipe bends. we showed and described sect of dies, for making superheater' pipe berids, said dies comprising. a

two perh ieniele die and a male hreeches die.

In using said dies, as explained in said e pplh cation, twopipe lengths to be joined bye pipe bend were, while at welding heat, clamped between the two halves of the fe-' male die, and the brceches die then 'i'orcibly inserted into the two pipe ends so esgo out through adjacent walls, and then abutsaid cut-portions and. weld them together. In using the said dies of the application men tioned, the pressure anplied' to the" brooches die to perform its necessary function is so great that the pipe lengths are apt to slip in the female die so that back stops, abutting against the remote ends of the two pipe lengths, or some equivalent holding means, becomes necessary. A in my improved die herewith disclosed I am able so hold the pipe lengthsby means of the female die alone without the aid of any external device such as back stops. and the like.

v Specification of Letters i'Patcnt.

hpplication filed July 7, 181%. Serial Bio. M41433.

Patented Aug. 31, 915.

Edy invention Will be better understood by reierring to the accompanying drawings in which Figure 1 represents a plan View, partly in section, showing my improved die together with certain associated ports necessary in the production of a pipe bend according to the disclosure of the above mentioned application, Serial No. 835,360, said die and parts being represented as attached to and operated by a suitable machine of known type; Fig. 2 is a view, similar to Fig. 1, showing a later position of the die and parts; Fig. 3 is a. section along the line 33 of Fig. 2; Fig. 4 is a view, similar to Figs. 1 andQ, showing a stilllater position of the parts; Fig. 5 is a "section along the line 55 of Fig. i; Fig. 6

is an end elevation, taken from the right of Fig. 4; and Fig. 7 is a perspective view of the incomplete pipe bend after it is taken from the die and before the latter operations necessary to complete it have been performed.

lo the drawingsfll and 2 represent a pair of fixed bed members integrally or otherwise attached'to the main fralneof a suitableme;

chine and having an open space or throat between them. To one of these members 1s fixed a hal'f i. oiighe female forming die,-

ihe other half, hbf sliicl forming die being arranged to'slide in e guide-way 5, formed in the other member 2, by means of a linkfi pivotallv attached to the die and operatively connected with sultable toggle driving mechenism (ndtshown). The opposed fzices cf the die halves. 3 and 4 are grooved and shaped as, shown in Figsl and 4. of the ap plication .No. 835,360 above referred to so asto hold the two pipe lengths which are to be united bye retunn bend and to cooperate I with the breeches die of said application in the production of said bend. When the two halves 3 and dare bropght together with ,pipe lengths in place said pipe lengths will plane as shown in the hreeches die will enter the cnds'of said pipe 4 lengths, cut and abut toe cut portionso-f ad jacent walls thereof, and then weld said walls together to 'n'oduce the incompiete bend. shown in Fit" L as explained in the specification No. 3G0 aforesaid.

A rectangular SQCLlWnQd gripping block or member 9 its into a similar but larger re cess formed in one end of the die half 3; this recess includes end portions oi? the two grooves preiiousl reierred to tor the re- )QCtiVQ )i )6 lene'ths. This block is roo ed l l 7 n to correspond witl the grooves oi the die. A stout blVCl} 10 is fitted into the die half 3 .and a pressure bioch ll, of rectangular secthrough the block and has its outer end, lying outside of the die block. flat and slotted as at 15. Adjacent to the spindle i i, a bracket 16 is fixed to the end of the die block and carries a pivotally attached bell crank lever 1'2} one arm of which has a cam lengths pin 18 adapted to engage a diamond shaped cam member 19 depending from a bracket 20 attached to and moving with the holder 7. The other arm 20 of lever 1.7 is connected by means of a spring 21 to the fixed member 2.

The other end of block 9 is connected by a tension spring 22 to the frame of themachine'as shown so as to be subject to a con stant pull in the direction indicated by the arrow the side of spring.

The bell crank lever 17 has a third arm 22' which carries a pin 23 in engagement with the slot p The operz-rtion of my invention is as follows: The parts being as shown in Fig. l, the two pipe lengths 2i and are placed in the grooves of the die half and the machine started thus causing die half i to be slid. in its guide-way 5 by the linlvfi', in the direction of the arrow. until the two die halves come together and clamp the pipe to the length of the die and the toggle is fully extended so that any force tending to separate the die halves manifests itself as r. compression strain in the length of the link whichis resisted by the fixed support upon the frame of the machine of the other end of the toggle. As the die half .4'is advanced toward die 3 the holder fl moves in the dircction of the arrow so that when the two die-halves finallv come together the breeches die will be just about to enter the pipe ends In this position the link 6, which is one member of a toggle ynnt 1n. the inn-- chinc chosen, lies substantially at right an (see liig. As the breeches die begins to" advance from-the position shown in FigS-l to that shown in lithe-cam pm ens gages the upper surface of: cam member 19 tor the pipe ends the cam pin 18 wil slip over the left hand end of cam member '19 and permit the arms 20 and 9.2 of the bell crank lever to be pulled b: again by the spring: iii parallel with the ends of the die 3, 2. thus jamming the gravy? of block 9" down against the two pipe 1 gt As the legs of the brooches die continue on into the pipe ends so as to cut the adjacent walls and abut and weld said walls together as described in the previously referred to ap' lication No. 835.34%), the end pressure t 115 brought to bear upon the pipes will, by rea son of the frictional engagement between block 51 and the pipe lengthen-tend to move block 9 to the right. Owing to the presence of pivotlO and pressure block 11, howe er, the eflect-of this tendency will be to wedge block 9 against the pipe lengths with a pressure which will increase with the end pressure due to the brooches die. The pipe lengths will, therefore, be securely held,

without slip, despite the great pressure brought to bear upon their ends. Owing to the length of block 9 the pipe lengths are firmly and securely held without crushing. The breeches.,.;lie haying reached the limit of its movement and the pipe lengths being Welded together is withdrawn by the holder 7 in the normal operation of the machine. As the holder is thus withdrawn, the cam pin 18, which is nowheld in its lowermost position by the tension.of the spring' 21, strikes the lowerncontour line of cam 'member 19, slides over the same and frees itself as the holder reaches its limiting positionto the left so as'to be in position to a in draw block to the left as another pail of pi lengths is clamped in the d1e A! t e breeches die is withdrawn the die half 4 is slid downwardly thus releasingthli partially completed pipe bend which 'now has. the form shown in. Fig. 7.

While I have shown apreferred form of my improved gripping and forging die, as used for a preferred purpose irifiny' changes of detail may be made within thespirit of the invention and scope'of the claims which follow, since the principle employedis one which may beadapted to forging, tossing,

cuttingoperations and the like w ich are quite different from'one another but which have the common characteristic that the manipulative force tendsto push the work from the die.

I therefore claim: v

1. A die comprising, in combination, a plurality of die members adapted to be fixedly closed together so as: to, grip the work, means for producing endwise operative pressurev upon the work, and means controlled by the endwise pressure for increasing the gripping pressure after the dies have been closed. i

2'. Av die comprising, in combination, a

plurality of die members adapted to be fixedly closed together so as to grip the -work, means for producing endwise operative pressure upon the work, and means controlled by the endwise pressure for increasing the gripping pressure as-the operative pressure isfincreased. I

3. A die comprising, in combination, a plurality of die members adapted to be fixedly closed together so as to grip the work means for producing endwise operative pressure upon the work and means for automatically increasingt'ne gripping pressure as the operative pressure is increased.

4. A die comprising,---i"n combination, a

plurality of die members adapted to be fixedly closed together so as to grip the work, means for producing endwise opera tive pressure upon the work, and means for automatically increasing the gripping pressure as the operative pressure is increased and proportionately thereto.

A die comprising, in combination, a

plurality of die members adapted to be fixedly clamped together,so as to hold the work, means for producing endwise opera-' tive pressure upon the work and a secondary gripping member arranged to co-act with one of said members so as to apply an increased pressure to'the .work as the operative pressure is increased.

6. A die comprising, ingcombination, a plurality of die members adapted to be fixedlyclamped together so as to hold the work, means for producing endwise operative pressure upon the work and a secondary gripping member between the work and one of said members, said secondary member being arranged to put an increased pressure upon the work as the operative ,pressure 15. increased.

'7. A die comprising, in combination, a

plurality of die members adapted to be fixedly clamped together so asto hold the work, means for producing endwise opera tive pressure upon the workfa secondary gripping member between the work and one of said members, means for holding said secondary member out of gripping contact with the work until the same-is-gripped by.

bers between said abutment and the ivork,

a maledie member, and means controlled by the male die member for holding the gripping block out of contact with the work until the operative pressure ,is applied and thus permitting said block toabe wedged between the work and the abutment.

9. In combination, a pair of relatively movable die members adapted to clamp the work, an abutment fixedly attaclied to one of said die niem bers, a movable gripping block recessed in the last'named die member between said abutment and the work, a male die member,and means controlled by the male die member for hold ng the gripping block out of contact with the work until the operative pressure is applied and thus permitting said block to be wedged between the work and the abutment.

10. A die comprising, in combination, a

plurality of die members adapted to be fixedly clamped together so as to hold the work, means for producing endwise operative pressure upon the work, a movable- NEAL TBIMBLE MCKEE.

Witnesses:

ELMER G. VVILLYOUNG, Far.n A. KLEIN. 

